Siddons or Siddon is a surname. Notable people with the surname include:
Anne Rivers Siddons (born 1936), American novelist
Bill Siddons, manager of the band The Doors (1968–1972)
Harold Siddons (born 1922), Northern Irish actor
Frederick Lincoln Siddons (1864–1931), U.S. federal judge
Jamie Siddons (born 1964), Australian cricketer
John Siddons (born 1927), retired Australian politician
Michael Siddons (born 1928), Wales Herald of Arms Extraordinary
Michael John Siddons-Corby (born 1951), English guitarist
Royston Siddons (1899–1976), Australian industrialist
Sarah Siddons (1775–1831), British actress
Dame Sarah Elizabeth Siddons Mair (1846–1941), Scottish suffragette campaigner
Tom Siddon (born 1941), former Canadian politician
William Siddons (1864–1893), English footballer
